Table 5.

Incremental Validity of the PMUM-Full Scale

		SDQ Outcomes
	SDQ Total
	ΔR2	β
Step 1	.13
Total Screen Time		.37**
Child age		−.17**
	F(2, 274) = 20.97**
Step 2	.24
Total Screen Time		.09
Child age		−.15**
PMUM Score		.56**
	F(3, 273) = 54.53**
	SDQ Peer Relationship Problems
Predictors	ΔR2	B
Step 1	.10
Total Screen Time		.32**
Child age		−.14*
	F(2, 274) = 15.09**
Step 2	.09
Total Screen Time		.16*
Child age		−.13*
PMUM Score		.34**
	F(3, 273) = 20.66**
	SDQ Hyperactivity and Inattention
Predictors	ΔR2	B
Step 1	.04
Total Screen Time		.16**
Child age		−.14*
	F(2, 274) = 4.97**
Step 2	.19
Total Screen Time		−.09
Child age		−.13*
PMUM Score		.50**
	F(3, 273) = 26.56**
	SDQ Emotional Symptoms
Predictors	ΔR2	B
Step 1	.11
Total Screen Time		.35**
Child age		−.06
	F(2, 274) = 17.44**
Step 2	.14
Total Screen Time		.13*
Child age		−.04
PMUM Score		.43**
	F(3, 273) = 31.12**
	SDQ Conduct Problems
Predictors	ΔR2	B
Step 1	.15
Total Screen Time		.38**
Child age		−.21**
	F(2, 274) = 23.71**
Step 2	.19
Total Screen Time		.13*
Child age		−.20**
PMUM Score		.50**
	F(3, 273) = 45.90**
	SDQ Prosocial Behaviors
Predictors	ΔR2	B
Step 1	.07
Total Screen Time		−.22**
Child age		.23**
	F(2, 274) = 10.82**
Step 2	.10
Total Screen Time		−.04
Child age		.22**
PMUM Score		−.36**
	F(3, 273) = 19.06**

^*p < .05,

^**p < .01